Initial version of contributing.md

CONTRIBUTING.md

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+# Contributing to mythril
+Hi, if you are reading this that means that you probably want to contribute to mythril, awesome!
+If not, then this file might not contain much useful information for you.
+
+## Creating an issue
+If you have found a problem with mythril or want to propose a new feature then you can do this using GitHub issues. 
+We already created some templates to make this process easier, but if your issue/feature request does not fit within the template then feel free to deviate.
+
+If you have a small question or aren't sure if you should create an issue for your problem/suggestion then you can always hop by on our gitter channel
+[![Join the chat at https://gitter.im/ConsenSys/mythril](https://badges.gitter.im/ConsenSys/mythril.svg)](https://gitter.im/ConsenSys/mythril?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
+# Coding
+If you want to help out with the development of mythril then you can take a look at our issues or waffle board. [![Waffle.io - Columns and their card count](https://badge.waffle.io/ConsenSys/mythril.svg?columns=all)](https://waffle.io/ConsenSys/mythril)
+
+Before you start working on an issue you should hop by on gitter to message a collaborator, this way we can assign you to the issue making sure nobody does double work. 
+We can also provide you with support through gitter if there are any questions during the development process.
+
+## New ideas
+Before you start working on a new idea, it's useful to create an issue on GitHub, that way we know what you want to implement and that you are working on it.
+Additionally, it might happen that your feature does not fit with our roadmap, in which case it would be unfortunate if you have already spent some time working on it.